chore: add copyright headers

Make sure we obey the REUSE (https://reuse.software) specification and the
origin, copyright owner, and license of all files are clearly marked.

The whole project is under the EPL-2.0, except for trivial files where copyright
is not applicable that are marked with the CC0-1.0 license. Moreover, code
included from third parties is also available under the respective license.

chore: add CONTRIBUTORS.md

List all authors and supporting organizations in accordance with the REUSE
specification.

1 files changed, 29 insertions, 0 deletions

diff --git a/.reuse/dep5 b/.reuse/dep5
new file mode 100644
index 00000000..523ac368
--- /dev/null
+++ b/.reuse/dep5
@@ -0,0 +1,29 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: Refinery
+Upstream-Contact: Dániel Varró <daniel.varro@liu.se>
+Source: https://github.com/graphs4value/refinery
+
+# Sample paragraph, commented out:
+#
+# Files: src/*
+# Copyright: $YEAR $NAME <$CONTACT>
+# License: ...
+
+Files: .yarn/releases/*.cjs
+Copyright: (c) 2016-present, Yarn Contributors. All rights reserved.
+           (c) 2014-present, Jon Schlinkert.
+           (c) 2014-2016, Jon Schlinkert.
+           (c) 2014-2017, Jon Schlinkert.
+           © 2015-2018, Jon Schlinkert.
+           (c) 2015-present, Jon Schlinkert.
+           (c) 2015, Rebecca Turner
+           Joyent, Inc. and other Node contributors.
+           Node.js contributors. All rights reserved.
+           (c) 2014 Blake Embrey (hello@blakeembrey.com)
+           (c) Facebook, Inc. and its affiliates.
+License: BSD-2-Clause AND MIT
+
+Files: .yarn/sdks/eslint/*
+       .yarn/sdks/typescript/*
+Copyright: (c) 2016-present, Yarn Contributors. All rights reserved.
+License: BSD-2-Clause